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An Arctic oil rig owned by Royal Dutch Shell remains grounded in storm-tossed shallow water, a week after the ship towing it broke down.

Shell said that the Kulluk rig, which is carrying 139,000 gallons of diesel and 12,000 gallons of hydraulic fluids, had shown no sign of springing a leak, but the company has not been able to shift it from its impromptu Alaskan berth off Sitkalidak Island, because of extreme wind speeds of up to 80 miles an hour.

Pictures showed waves crashing over the 266ft rig, which has cost Shell $292 million in upgrade and maintenance costs